[INFO] fetching crate manage 0.12.0...
[INFO] checking manage-0.12.0 against 1.95.0 for pr-155915
[INFO] extracting crate manage 0.12.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate manage 0.12.0
[INFO] finished tweaking crates.io crate manage 0.12.0
[INFO] tweaked toml for crates.io crate manage 0.12.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate manage 0.12.0 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate manage 0.12.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded refs v0.15.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4a00a7a5d1704df6b69f848e79c94d5c83b7017e5a3c91c87c51a72f47a0f1b1
[INFO] running `Command { std: "docker" "start" "-a" "4a00a7a5d1704df6b69f848e79c94d5c83b7017e5a3c91c87c51a72f47a0f1b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a00a7a5d1704df6b69f848e79c94d5c83b7017e5a3c91c87c51a72f47a0f1b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a00a7a5d1704df6b69f848e79c94d5c83b7017e5a3c91c87c51a72f47a0f1b1", kill_on_drop: false }`
[INFO] [stdout] 4a00a7a5d1704df6b69f848e79c94d5c83b7017e5a3c91c87c51a72f47a0f1b1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 41a2509d3cfca214d1efc8745d285e3b561fbc7dd35dcb2241be9902927d8251
[INFO] running `Command { std: "docker" "start" "-a" "41a2509d3cfca214d1efc8745d285e3b561fbc7dd35dcb2241be9902927d8251", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-sink v0.3.31
[INFO] [stderr]     Checking memchr v2.7.5
[INFO] [stderr]     Checking sdd v3.0.10
[INFO] [stderr]    Compiling derive_more-impl v2.0.1
[INFO] [stderr]     Checking parking_lot_core v0.9.11
[INFO] [stderr]    Compiling serial_test_derive v3.2.0
[INFO] [stderr]     Checking futures-channel v0.3.31
[INFO] [stderr]     Checking parking_lot v0.12.4
[INFO] [stderr]     Checking scc v2.4.0
[INFO] [stderr]     Checking futures-util v0.3.31
[INFO] [stderr]     Checking derive_more v2.0.1
[INFO] [stderr]     Checking refs v0.15.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/refs-0.15.1/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `refs` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "41a2509d3cfca214d1efc8745d285e3b561fbc7dd35dcb2241be9902927d8251", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41a2509d3cfca214d1efc8745d285e3b561fbc7dd35dcb2241be9902927d8251", kill_on_drop: false }`
[INFO] [stdout] 41a2509d3cfca214d1efc8745d285e3b561fbc7dd35dcb2241be9902927d8251